Rebel members of President Donald Trump’s party have helped pass a vote to reject his declaration of an emergency on the US-Mexico border.
Twelve Republican senators broke party ranks to side with Democrats, approving a proposal to revoke the proclamation by 59-41.
The Democratic-controlled House of Representatives last month backed the measure.
Following Thursday’s vote, Mr Trump tweeted: “VETO!”
Congress needs a two-thirds majority of both chambers to override a presidential veto, which is viewed as unlikely in this case.
Nevertheless, the vote will be seen as an embarrassing loss for the president on his signature domestic issue.
On Twitter, Mr Trump slammed the vote, calling it a “Democrat inspired Resolution which would OPEN BORDERS while increasing Crime, Drugs and Trafficking in our Country”.
I look forward to VETOING the just passed Democrat inspired Resolution which would OPEN BORDERS while increasing Crime, Drugs, and Trafficking in our Country. I thank all of the Strong Republicans who voted to support Border Security and our desperately needed WALL!
— Donald J. Trump (@realDonaldTrump) March 14, 2019